Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt

Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Kurat, G. [verfasserIn] Palme, H. Embey-Isztin, A. Touret, J. Ntaflos, T. Spettel, B. Brandstätten, F. Palme, C. Dreibus, G. Prinz, M.

Format:	Artikel
Sprache:	Englisch

Erschienen:	1993

Schlagwörter:	Olivine Fluid Inclusion Ultramafic Rock Incompatible Element Ultramafic Complex

Systematik:	TE 1000

Anmerkung:	© Springer-Verlag 1993

Übergeordnetes Werk:	Enthalten in: Mineralogy and petrology - Springer-Verlag, 1987, 48(1993), 2-4 vom: Juni, Seite 309-341
Übergeordnetes Werk:	volume:48 ; year:1993 ; number:2-4 ; month:06 ; pages:309-341

Links:	Volltext

DOI / URN:	10.1007/BF01163106

Katalog-ID:	OLC2062478496

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245	1	0	\|a Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt
264		1	\|c 1993
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520			\|a Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments.
650		4	\|a Olivine
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700	1		\|a Embey-Isztin, A. \|4 aut
700	1		\|a Touret, J. \|4 aut
700	1		\|a Ntaflos, T. \|4 aut
700	1		\|a Spettel, B. \|4 aut
700	1		\|a Brandstätten, F. \|4 aut
700	1		\|a Palme, C. \|4 aut
700	1		\|a Dreibus, G. \|4 aut
700	1		\|a Prinz, M. \|4 aut
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Indexfelder

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matchkey_str	article:09300708:1993----::erlgadeceityfeioieadsoitdenokoz
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allfields	10.1007/BF01163106 doi (DE-627)OLC2062478496 (DE-He213)BF01163106-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Kurat, G. verfasserin aut Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. Olivine Fluid Inclusion Ultramafic Rock Incompatible Element Ultramafic Complex Palme, H. aut Embey-Isztin, A. aut Touret, J. aut Ntaflos, T. aut Spettel, B. aut Brandstätten, F. aut Palme, C. aut Dreibus, G. aut Prinz, M. aut Enthalten in Mineralogy and petrology Springer-Verlag, 1987 48(1993), 2-4 vom: Juni, Seite 309-341 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:48 year:1993 number:2-4 month:06 pages:309-341 https://doi.org/10.1007/BF01163106 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4306 GBV_ILN_4307 TE 1000 AR 48 1993 2-4 06 309-341
spelling	10.1007/BF01163106 doi (DE-627)OLC2062478496 (DE-He213)BF01163106-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Kurat, G. verfasserin aut Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. Olivine Fluid Inclusion Ultramafic Rock Incompatible Element Ultramafic Complex Palme, H. aut Embey-Isztin, A. aut Touret, J. aut Ntaflos, T. aut Spettel, B. aut Brandstätten, F. aut Palme, C. aut Dreibus, G. aut Prinz, M. aut Enthalten in Mineralogy and petrology Springer-Verlag, 1987 48(1993), 2-4 vom: Juni, Seite 309-341 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:48 year:1993 number:2-4 month:06 pages:309-341 https://doi.org/10.1007/BF01163106 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4306 GBV_ILN_4307 TE 1000 AR 48 1993 2-4 06 309-341
allfields_unstemmed	10.1007/BF01163106 doi (DE-627)OLC2062478496 (DE-He213)BF01163106-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Kurat, G. verfasserin aut Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. Olivine Fluid Inclusion Ultramafic Rock Incompatible Element Ultramafic Complex Palme, H. aut Embey-Isztin, A. aut Touret, J. aut Ntaflos, T. aut Spettel, B. aut Brandstätten, F. aut Palme, C. aut Dreibus, G. aut Prinz, M. aut Enthalten in Mineralogy and petrology Springer-Verlag, 1987 48(1993), 2-4 vom: Juni, Seite 309-341 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:48 year:1993 number:2-4 month:06 pages:309-341 https://doi.org/10.1007/BF01163106 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4306 GBV_ILN_4307 TE 1000 AR 48 1993 2-4 06 309-341
allfieldsGer	10.1007/BF01163106 doi (DE-627)OLC2062478496 (DE-He213)BF01163106-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Kurat, G. verfasserin aut Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. Olivine Fluid Inclusion Ultramafic Rock Incompatible Element Ultramafic Complex Palme, H. aut Embey-Isztin, A. aut Touret, J. aut Ntaflos, T. aut Spettel, B. aut Brandstätten, F. aut Palme, C. aut Dreibus, G. aut Prinz, M. aut Enthalten in Mineralogy and petrology Springer-Verlag, 1987 48(1993), 2-4 vom: Juni, Seite 309-341 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:48 year:1993 number:2-4 month:06 pages:309-341 https://doi.org/10.1007/BF01163106 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4306 GBV_ILN_4307 TE 1000 AR 48 1993 2-4 06 309-341
allfieldsSound	10.1007/BF01163106 doi (DE-627)OLC2062478496 (DE-He213)BF01163106-p DE-627 ger DE-627 rakwb eng 550 VZ 13 ssgn TE 1000 VZ rvk Kurat, G. verfasserin aut Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt 1993 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1993 Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. Olivine Fluid Inclusion Ultramafic Rock Incompatible Element Ultramafic Complex Palme, H. aut Embey-Isztin, A. aut Touret, J. aut Ntaflos, T. aut Spettel, B. aut Brandstätten, F. aut Palme, C. aut Dreibus, G. aut Prinz, M. aut Enthalten in Mineralogy and petrology Springer-Verlag, 1987 48(1993), 2-4 vom: Juni, Seite 309-341 (DE-627)129383856 (DE-600)166036-6 (DE-576)014770881 0930-0708 nnns volume:48 year:1993 number:2-4 month:06 pages:309-341 https://doi.org/10.1007/BF01163106 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_11 GBV_ILN_22 GBV_ILN_31 GBV_ILN_40 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2004 GBV_ILN_2006 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4029 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4306 GBV_ILN_4307 TE 1000 AR 48 1993 2-4 06 309-341
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title_sort	petrology and geochemistry of peridotites and associated vein rocks of zabargad island, red sea, egypt
title_auth	Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt
abstract	Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. © Springer-Verlag 1993
abstractGer	Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. © Springer-Verlag 1993
abstract_unstemmed	Summary Zabargad (St. John's) Island in the Red Sea contains three ultramafic bodies, one of which bas produced the famous gem olivine (peridot). The ultramafic rock types consist of two major groups—the peridotites and the vein rocks within them. The peridotites are divided into three groups: primitive, depleted and metasomatized. The primitive peridotites are the most abundant and are represented by mainly pristine spinellherzolites which have chemical compositions representative of the subcontinental upper mantle. The depleted peridotites are mainly harzburgites and nome dunites and both are similar to worldwide occurrences. The most depleted peridotites also appear to have the greatest metasomatic additions of incompatible elements, as has been noted at other localities. Metasomatic additions were clearly accompanied by tectonic shearing. Metasomatism included infiltration of incompatible elements and the formation of porphyroblasts of clinopyroxene, amphibole, Al-spinel and plagioclase; il took place under a variety of p-T conditions and with fluids of differing compositions. The vein rocks are mainly monomineralic and comprise olivinites, orthopyroxenites, clinopyroxenites, websterites, hornblendites and plagioclasites. These rocks are believed to have formed from fluids similar to that which metasomatized the host rock, rather than by some kind of igneous process. The fluids were derived from peridotite reservoirs (fertile and depleted) and apparently were in equilibrium with these reservoirs. Highly abundant fluid inclusions document the hypersaline and $ CO_{2} $-dominated character of these fluids. Monomineralic vein rocks are closely associated with metasomatic and tectonic processes, and there is a complete transition between metasomatic impregnation and formation of vein rocks. These processes may have also been active in other peridotite bodies of the world, as was earlier recognized and documented in the Seiad Ultramafic Complex, California. Metasomatism is evident along clinopyroxenite and hornblendite veins, whereas orthopyroxenites, olivinites and plagioclasites do not show any interaction with the wall rocks. Olivinites are probably the latest (lowest p-T) vein rock type, and the latest olivine which formed within their open cavities became the gem peridot. Zabargad ultramafic rocks preserve relic phases indicating an initial depth of origin greater than 85 km. Clinopyroxenites preserve the memories of the highest p-T conditions and they may be the first vein rock type formed in the peridotites. The p-T path of uplift coincides with the oceanic geotherm at great depth but deviates systematically from it with falling pressure in a series of tectonic stages accompanied by metasomatism and recrystallization. The p-T and petrologic history indicates rapid uplift, a feature which is supported by extensive contact metamorphism of the associated metasediments. © Springer-Verlag 1993
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container_issue	2-4
title_short	Petrology and geochemistry of peridotites and associated vein rocks of Zabargad Island, Red Sea, Egypt
url	https://doi.org/10.1007/BF01163106
remote_bool	false
author2	Palme, H. Embey-Isztin, A. Touret, J. Ntaflos, T. Spettel, B. Brandstätten, F. Palme, C. Dreibus, G. Prinz, M.
author2Str	Palme, H. Embey-Isztin, A. Touret, J. Ntaflos, T. Spettel, B. Brandstätten, F. Palme, C. Dreibus, G. Prinz, M.
ppnlink	129383856
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hochschulschrift_bool	false
doi_str	10.1007/BF01163106
up_date	2024-07-03T15:12:59.064Z
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